Disclosed is an image forming apparatus that includes a plurality of developing devices capable of developing an electrostatic latent image on an image bearing member at a developing position, a developing device moving apparatus for holding the plurality of developing devices and selectively moving one of the plurality of developing devices to the developing position, a connecting portion disposed on an apparatus main body side for electrically connecting a developing device located at the developing position to an apparatus main body, and to-be-connected portions disposed to the plurality of developing devices, respectively and coming into contact with the connecting portion, wherein any one of the connecting portion and the to-be-connected portions comprises a rotary member which is rotated by being in contact with the other of them.